On the website you just need finished diaries. the photo of the month or meme contests you just need a photo or meme etc. If the button lets you join, you must have something elegible. if not, it doesn'tmeet requirements.
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For cannabis cup and the like? you pay some inordinate fee, then give out a whole boatload of weed to random ppl that amount to someone's pack of friends and others who paid money to vote etc.. money, money, money , money LOL and marketing. extenda-peen engaged!.